import tmIcon from '../tm-icon/tm-icon.vue'
import tmText from '../tm-text/tm-text.vue'
import { getCurrentInstance, nextTick, onMounted, ref, Ref, watch } from 'vue'
import { propsdetail } from './propsdetail'
const proxy = getCurrentInstance()?.proxy ?? null
const emits = defineEmits(['bottom', 'change', 'refresh', 'timeout', 'update:modelValue', 'update:bottomValue'])
const props = defineProps({
  ...propsdetail,
})
// 下拉开始的起点，主要用于计算下拉高度
const startPoint: Ref<{
  pageX: number
  pageY: number
} | null> = ref(null)
const isPulling = ref(false) // 是否下拉中
const _maxBarHeight = ref(props.maxBarHeight) // 最大下拉高度，单位 rpx
// 触发刷新的下拉高度，单位rpx
// 松开时下拉高度大于这个值即会触发刷新，触发刷新后松开，会恢复到这个高度并保持，直到刷新结束
const _barHeight = ref(0)
/** 开始刷新 - 刷新成功/失败 最大间隔时间setTimeout句柄 */
let maxRefreshAnimateTimeFlag: number | null = 0
/** 关闭动画耗时setTimeout句柄 */
let closingAnimateTimeFlag: number | null = 0
//加载框的高度
const refreshStatus = ref(-1)
const loosing = ref(false)
const enableToRefresh = ref(true)
const scrollTop = ref(0)

/** 触底下拉刷新参数。 */
const isBootRefresh = ref(props.bottomValue)

watch(
  () => props.modelValue,
  () => {
    if (!props.modelValue) {
      if (maxRefreshAnimateTimeFlag != null) {
        clearTimeout(maxRefreshAnimateTimeFlag)
      }
      refreshStatus.value = 3
      close()
    }
  }
)
watch(
  () => props.bottomValue,
  () => {
    isBootRefresh.value = props.bottomValue
  }
)
onMounted(() => {
  clearTimeout(maxRefreshAnimateTimeFlag)
  clearTimeout(closingAnimateTimeFlag)
  nextTick(() => setDefault())
})

function setDefault() {
  if (props.defaultValue) {
    setRefreshBarHeight(props.loadBarHeight)
    refreshStatus.value = 2
    loosing.value = true
    isPulling.value = true
    enableToRefresh.value = false
    startPoint.value = null
  }
}

function onScrollToBottom() {
  if (isBootRefresh.value) return
  emits('update:bottomValue')
  emits('bottom')
}

function onScrollToTop() {
  enableToRefresh.value = true
}

function onScroll(e: any) {
  enableToRefresh.value = e.detail?.scrollTop === 0
}

function setScrollTop(tp: number) {
  scrollTop.value = tp
}

function scrollToTop() {
  setScrollTop(0)
}

function onTouchStart(e: WechatMiniprogram.Component.TrivialInstance) {
  if (isPulling.value || !enableToRefresh.value) return
  const { touches } = e
  if (touches.length !== 1) return
  const { pageX, pageY } = touches[0]

  loosing.value = false
  startPoint.value = {
    pageX,
    pageY,
  }
  isPulling.value = true
}

function onTouchMove(e: WechatMiniprogram.Component.TrivialInstance) {
  if (!startPoint.value) return
  const { touches } = e

  if (touches.length !== 1) return

  const { pageY } = touches[0]
  const offset = pageY - startPoint.value.pageY
  const barsHeight = uni.$tm.u.torpx(offset)

  if (barsHeight > 0) {
    if (barsHeight > _maxBarHeight.value) {
      // 限高
      setRefreshBarHeight(_maxBarHeight.value)
      // this.startPoint.pageY = pageY - this.toPx(this.maxBarHeight); // 限高的同时修正起点，避免触摸点上移时无效果
    } else {
      setRefreshBarHeight(barsHeight)
    }
  }
}

function onTouchEnd(e: WechatMiniprogram.Component.TrivialInstance) {
  if (!startPoint.value) return
  const { changedTouches } = e
  if (changedTouches.length !== 1) return
  const { pageY } = changedTouches[0]
  const barsHeight = uni.$tm.u.torpx(pageY - startPoint.value.pageY)
  startPoint.value = null // 清掉起点，之后将忽略touchMove、touchEnd事件

  loosing.value = true
  isBootRefresh.value = false
  // 松开时高度超过阈值则触发刷新
  if (barsHeight > props.loadBarHeight) {
    _barHeight.value = props.loadBarHeight
    refreshStatus.value = 2

    emits('change', true)
    emits('update:modelValue', true)
    emits('refresh')
    maxRefreshAnimateTimeFlag = setTimeout(() => {
      maxRefreshAnimateTimeFlag = null

      if (refreshStatus.value === 2) {
        // 超时回调
        emits('timeout')
        close() // 超时仍未被回调，则直接结束下拉
      }
    }, props.refreshTimeout as any) as any as number
  } else {
    close()
  }
}

function setRefreshBarHeight(barsHeight: number) {
  if (barsHeight >= props.loadBarHeight) {
    refreshStatus.value = 1
  } else {
    refreshStatus.value = 0
  }
  return new Promise((resolve) => {
    _barHeight.value = barsHeight
    nextTick(() => {
      resolve(barsHeight)
    })
  })
}

function close() {
  const animationDuration = 350
  _barHeight.value = 0
  emits('change', false)
  emits('update:modelValue', false)
  closingAnimateTimeFlag = setTimeout(() => {
    closingAnimateTimeFlag = null
    refreshStatus.value = -1
    isPulling.value = false // 退出下拉状态
    loosing.value = false
    enableToRefresh.value = true
  }, animationDuration) as any as number
}
